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Design the chilled water suction and discharge pipes mainly depends on the flow.
There are many charts which give the pipe dia on the basis of flow in closed water circuits and open water circuits.
Chilled water circuits are basically closed loop circuits so take that chart and against the flow you can select numerous dia of pipes but smaller the pipe more the velocity and friction. So normally the velocity is taken between4 -8 ft/sec or friction equal to4feet per100 feet.
Chilled water pumps are selected on basically two factors flow and head and types are normally end suction centrifugal type.
The pumps manufacturers give you the selection softwares or chart for range of flows against different heads. Normally the efficiency is taken around65 -85%.
Hope this will work.
to design chilled water pipe size it is depending on water flow andthe accepted velocity through the pipes and as per standard it will be5-7 ft/sec and friction4ft/100ft
so from Q=A * V you can get the size of pipes or use the software programs which designed based on standard to get the size of pipes
chilled water pump designed based on flow and head for example flow less than700 gpm you can use end section pump more than this you are going to use centrifugal pump
flow you will take from the sum of all units ( FCU ,AHU,FAHU ) and head from friction loss on pipes and valves for longest path because chilled water is closed circuit
Q= m c (T2-T1)
Q= A V
you can use duct sizer programme
